EP2182377B1 - Scanner laser mesurant l'éloignement - Google Patents

Scanner laser mesurant l'éloignement Download PDF

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Publication number
EP2182377B1
EP2182377B1 EP08105705A EP08105705A EP2182377B1 EP 2182377 B1 EP2182377 B1 EP 2182377B1 EP 08105705 A EP08105705 A EP 08105705A EP 08105705 A EP08105705 A EP 08105705A EP 2182377 B1 EP2182377 B1 EP 2182377B1
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EP
European Patent Office
Prior art keywords
amplification
reception signal
signal
laser scanner
path
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EP08105705A
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German (de)
English (en)
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EP2182377A1 (fr
Inventor
Sebastian Pastor
Thomas Schopp
Helmut Themel
Jacek Zienkiewicz
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Sick AG
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Sick AG
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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/483—Details of pulse systems
    • G01S7/486—Receivers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/483—Details of pulse systems
    • G01S7/486—Receivers
    • G01S7/4868—Controlling received signal intensity or exposure of sensor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
    • G01S17/06—Systems determining position data of a target
    • G01S17/42—Simultaneous measurement of distance and other co-ordinates

Definitions

  • the invention relates to a distance-measuring laser scanner and a method for detecting distances by means of a laser scanner with a gain of the received signal according to the preamble of claim 1 and 11, respectively.
  • Laser scanners can be used to determine distances or distances in a surveillance area. For this purpose, the light transit time between emission and reception of a light signal is evaluated, which is remitted or reflected by a surface in the monitoring area.
  • pulse transit time methods individual short light pulses are emitted and their transit time is determined on the basis of a characteristic of the pulse, for example its maximum.
  • phase method the light is amplitude modulated and evaluated the phase shift of the emitted versus the received light. Phase methods initially have a uniqueness range limited by the modulation frequency of the light used, but this can be extended by additional measures. Both methods provide the distance value to the current scan point.
  • a scanning movement which is often realized by means of movable deflection elements, for example a rotating mirror
  • scanning lines and thus distance profiles can be determined.
  • a movement in the transverse direction to the scan line is also provided, for example by a further deflection mechanism or a relative movement by attachment of the scanner to a vehicle or via a conveyor belt or a road, then three-dimensional elevation maps can be recorded.
  • the dynamic range of the received signal power in which a laser scanner works is very high.
  • One reason for this are the different surface properties and thus different remission behavior, which can vary between extremes such as black velvet on the one hand and a reflector on the other hand.
  • Another cause lies in the square received signal loss with the distance, which can change very abruptly, for example, at object edges.
  • the receiving system of the laser scanner must be designed so that an evaluation of the received signal can take place over this entire dynamic range.
  • a transimpedance amplifier is often used after the light receiver, which is operated overdriven for large received signals.
  • the following evaluation stages no longer have the signal information lost due to the overshoot, and this loss results in an increased measurement error.
  • the waveform is heavily distorted, the received signals are widened and complicate the evaluation or make them impossible. This is especially true in pulse methods, when receiving pulses follow each other very closely due to, for example, a edge hit.
  • the reverse approach to avoid overdriving by adjusting the dynamic range to strong received signals, leads to poor detection of weak received signals and therefore brings even more serious disadvantages.
  • actuators for adjusting the amplifier in distance-measuring laser systems.
  • these are only of limited suitability for scanning rangefinders because the necessary reinforcements with the scanning movement constantly change.
  • the gain can be adjusted to the reception strength of a previous measurement point.
  • an edge or a color change can override the amplifier set only for an adjacent point in the monitoring area or deliver a reception signal that is no longer resolvable.
  • the actuators by no means ensure that the gain fits better than any preset. This is especially true for high-contrast, varied environments and fast scanning or relative movements.
  • the receiving unit is connected downstream of a series circuit of load resistors, each of which is assigned a separate amplifier for the incoming at each load resistor, successively attenuated daughter pulse.
  • a selection unit selects the largest non-overdriven subsidiary pulse for evaluation.
  • the US 5,311,353 discloses a high dynamic range optical receiver in which a first linear and a second logarithmic amplifier are provided.
  • the two amplified partial signals are either added up or one of the two signals is selected for the evaluation.
  • the gain is linear for weak signals in the dynamic range of the first amplifier and, after being overdriven, converts to logarithmic amplification for strong signals.
  • This object is achieved by a laser scanner according to claim 1 and a method for detecting distances by means of laser scanner according to claim 11.
  • the solution according to the invention is based on the principle of dividing the dynamic range which is too large for a single amplifier element and thus significantly increasing the effective dynamic range.
  • the invention has the advantage that the insensitive amplification path is not overridden, or at least only with particularly strong received signals. This leads to a higher measurement accuracy and allows to evaluate the distortion-free or less distorted form of the received signal. Because of the separate evaluation of strong and weak signals, the separation of individual peaks within the same received signal or of consecutive received signals is in one greater dynamic range possible. Weak reception signals, for example from a windshield or mist droplets, which falsify the measurement result by overlapping with the actual useful signal, can be suppressed by the separate evaluation. This allows distance or distance determinations over the entire measuring range right up to the front screen. The suppression of an interference signal from the windscreen is also independent of the degree of contamination of the windscreen and therefore robust.
  • the dynamic range in which the signal form can be evaluated largely without loss of information is a range of distortion-free, at least low-distortion and preferably linear amplification. That the two gain paths zugefeitete Signal may be the amplified received signal or a quantity derived therefrom, in particular a voltage or a current.
  • the invention proves to be particularly advantageous in the case of a pulse-based laser scanner, which thus uses pulses as a signal, thus emits light pulses and evaluates one or more received pulses resulting from this transmission pulse.
  • Phase-based laser scanners can be dynamically readjusted due to the permanently transmitted modulated light.
  • the invention also shows advantages for phase-based distance measurement, because the received signal strength can change very quickly and the conventional readjustment is too slow even with modulated cw light.
  • the emitted light signals can also be multiple pulses or other amplitude modulations. The permissible duration of the emitted light signal depends on the application, primarily the distances to be measured and the scanning speed.
  • pulse-based methods often only one received pulse is expected and evaluated.
  • it is also provided to evaluate multiple received pulses, which result from the same transmit pulse.
  • Such multiple pulses can arise, for example, when the laser light must first pass through obstacles such as fog, raindrops or glass surfaces before it encounters the object surface actually to be evaluated.
  • Multiple pulses can be evaluated, for example, by recording the entire received signal.
  • it is possible to process the high signal dynamics of several partial receive pulses or peak in the received signal, which can have very different amplitudes depending on the remission properties.
  • the evaluation can be very accurate.
  • the light receiving element is preferably designed to convert the received light into a photocurrent, wherein the received signal splitting element can generate partial currents, in particular differently strong partial currents of the photocurrent, and supply them to the amplification paths.
  • the received signal splitting element can generate partial currents, in particular differently strong partial currents of the photocurrent, and supply them to the amplification paths.
  • Only the sensitive amplification path requires as much of the received signal as possible in order to still resolve weak signals. The asymmetry in the partial flows can therefore be quite considerable. Whenever, with a received signal, the remaining smaller partial current in the insensitive amplification path is no longer sufficient to produce an output signal With sufficient amplitude to generate, the necessary information is already considered in the sensitive gain path anyway.
  • the first amplifier is preferably designed with a more sensitive dynamic range and / or with a larger amplification factor than the second amplifier.
  • deliberately overriding the sensitive amplification path is already accepted in the case of signals of moderate strength.
  • weak reception signals are to be processed.
  • the insensitive amplification path increases less, because there an override should be avoided and weak received signals would not be resolved anyway sufficient.
  • the overall effective gain in the sensitive path is preferably large versus the overall effective gain in the insensitive path.
  • the overall effective gain results from a combination between the signal components applied to the respective amplification path and the gain or gain of the first and second amplifiers.
  • the overall effective gain may differ by factors 5 to 10, but also by factors 100 or 1000.
  • the total dynamic range to be processed may easily comprise several orders of magnitude, and correspondingly, the ratio between the total effective gains may also be several orders of magnitude.
  • the amplification paths are conducted via a signal combining element to a common analog / digital converter, wherein in particular the analog / digital converter is formed together with a memory on a module in which digitized received signals can be stored.
  • the actual signal evaluation and thus the distance determination takes place digitally.
  • pulse widths of the order of magnitude of nanoseconds and a desired accuracy of the transit time determination in the picosecond range correspondingly fast analog / digital converters are very cost-intensive building blocks. Therefore, it is advantageous if the received signals of the two amplification paths can be digitized together in order to manage with only one of these components.
  • An integrated memory decouples the digitization from the evaluation, in that the evaluation unit accesses the data representing the received signal according to its own time rules. The effective overall gain in both gain paths is then chosen in that the amplitudes of the amplified received signals exploit the full bit width of the analog / digital converter for the widest possible range of applications.
  • the signal combining element is preferably designed as an adder.
  • the combination of the received signals from the two amplification paths is reversible.
  • the digitization takes place in a single step in one building block, but the individual signals can be easily recovered. From the point of view of the evaluation unit, this means that dispensing with an analog / digital converter is no more than a loss of resolution accuracy which has little influence on the measurement accuracy.
  • the evaluation unit preferably has a preprocessing section which is designed in particular for digital filtering and / or digital inversion of known distortions in the analog processing path preceding the digitization, in particular the amplification paths. With inversion mathematical operations are included, which digitally reverse known or to be measured signal distortions by the analog electronics.
  • the preprocessing section can also be implemented as a separate logic module.
  • logic module means a programmable digital component, for example a microprocessor, a FPGA (Field Programmable Gate Array), a DSP (Digital Signal Processor) or an ASIC (Application-Specific Integrated Circuit).
  • the evaluation unit advantageously has a main processing section which is designed to evaluate several or all peaks of a received signal following a transmitted light signal, which peak is to be assigned to an object whose distance is to be determined, in particular by means of function fit. For example, it may be known that the first peak reproducibly comes from the own windscreen and therefore should not be evaluated. From the peak shape it can be deduced whether it is a reflection of raindrops or fog. These peaks are not considered as a measured value, of interest is only one object in the surveillance area. The position of the peak associated with the object must be determined as accurately as possible in order to know the light transit time and thus the distance.
  • the preprocessing section or the main processing section is preferably designed for a preselection, by means of which it is decided whether, in each case for a distance determination, the peaks of the received signal are from the sensitive one or from the insensitive amplification path or from both amplification paths are evaluated. Because of the large differences in the overall effective gain, in practice the amplified received signal of one of the two amplification paths is either overdriven or barely recognizable.
  • the decision as to which amplification path is evaluated in each case can be made, for example, based on the question as to whether a peak having a required minimum height can be detected in the insensitive amplification path. If this is the case, it is evaluated, because then it is clear that the sensitive gain path is overdriven. Otherwise, the received signal of the sensitive amplification path is evaluated.
  • a third and / or further amplification path can be provided with its own sensitivity range. In fact, even if two gain paths split the dynamic range, given the expected high dynamics, a single amplifier with its associated dynamic range can be overwhelmed. Alternatively, cheaper amplifiers, each with a smaller distortion-free or linear range, can be used.
  • inventive method can be configured in a similar manner by further features and shows similar advantages. Such further features are exemplary, but not exhaustive, in which subclaims following the device claim are described.
  • FIG. 1 shows a very schematic simplification of a laser scanner 10, which emits a light pulse 12 in a monitoring area 14 with a laser light source.
  • the light pulse 12 is reflected or remitted on a surface 16 in the monitoring area 14 and received as a receiving pulse 18 from the laser scanner 10. From the light transit time between emission and reception of the light pulse 12, 18, the laser scanner 10 determines the distance of the surface 16.
  • a phase method can be used as an alternative to a pulse method.
  • the invention will be described below with the example of pulses.
  • the general functioning of a laser scanner 10 including its scanning mechanism, realized for example by a rotating mirror, optics in the transmitting and receiving channel and the like is known, for example from the DE 43 40 756 A1 or the introductory one already mentioned EP 1 936 400 A1 , and will not be explained here.
  • the received pulse 18 has in contrast to the transmission pulse 12 on several peaks. These multiple peaks may be caused by partially transparent perturbations (not shown) in the optical path between the laser scanner 10 and the surface 16. Causes may be, for example, fog or raindrops or glass surfaces including a windshield of the laser scanner 10. According to the invention, it is provided in a preferred embodiment to evaluate the shape of the received pulse 18 as a whole, ie to decide within the evaluation which peak is the actual measurement receive pulse from the surface 16. For this purpose, the course of the received pulse 18 is sampled and evaluated.
  • FIG. 2 shows in a block diagram the receiving channel of the laser scanner 10 according to an embodiment of the invention.
  • the received pulse 18 is converted into an electrical signal or a photocurrent I by a light receiving element 20, for example a photodiode, a PIN diode (positive intrinsic negative diode), an APD (avalanche photodiode).
  • the light-receiving element 20 could alternatively also be formed as a multiplicity, for example as a matrix or line of photosensitive elements.
  • the light receiving element 20, a splitter 22 is connected downstream.
  • the splitter 22 splits the photocurrent strongly asymmetrically into two partial currents I1 and I2, so that I2 >> I1 holds.
  • Both partial currents are then amplified in a respective first and second transimpedance amplifier 24, 26.
  • the transimpedance amplifiers have different dynamic ranges and different amplification factors.
  • the first transimpedance amplifier 24 in the upper insensitive path operates for relatively strong input signals in the distortion-free and linear regions, respectively, and amplifies with a relatively low amplification factor.
  • the second transimpedance amplifier 26 operates in the lower path for weak, in particular the weakest to be resolved receiving signals as possible distortion-free and amplified with a high gain factor.
  • the voltage signals U1, U2 of the amplified partial currents I1, I2 are digitized in analog / digital converters 28, 30 and then digitally evaluated in a controller 32 to a peak belonging to the surface 16, its position and thus over the light time to the Surface 16 to calculate their distance or distance.
  • the controller has one or more logic modules.
  • the digitized received signals are preprocessed and further processed by means of a DSP 36.
  • Other or a common logic module can also be used for these tasks.
  • the preprocessing may include, but is not limited to, digital filtering or inverse digital operation to compensate for non-faithful analog signal processing.
  • digital filters recursive filters (IIR, Infinite Impulse Response) can be used as nonrecursive filters Filter (FIR, Finite Impulse Response).
  • IIR Infinite Impulse Response
  • FIR Finite Impulse Response
  • Inverse convolution or digital decompression are examples of digital preprocessing to compensate for distortions by the analog part of the receive path. For example, the limited bandwidth of the analog devices results in higher signal amplitudes being cut off. But if one knows the transfer function of the analog components, then an inverse function can be calculated from it, which reverses the resulting distortion. This digitally reconstructs the truncated amplitude information. In this way, prior knowledge of the analog electronics can be used to compensate for distortions of the received signal.
  • the DSP 36 has an unencumbered and at least partially equalized signal for further processing.
  • peaks are first detected by looking for maxima above a noise threshold.
  • functions are fitted, which correspond to the expected received pulse shape.
  • This expected received pulse shape depends primarily on the emitted light pulse. Simple evaluation allows parabolic pulses, because here already three sample points are sufficient for the polynomial fit.
  • the position of the maximum determined from the fitted peak function is not limited to the grid of the sample points, so that the accuracy lies in the subsample area.
  • orientation In addition to the position of the maximum, other characteristics can also be included in the orientation, such as inflection point, rising and falling edges, symmetries, the pulse width and others.
  • FIGS. 3 to 5 show some exemplary temporal received signal waveforms to illustrate the different amplification in the two paths.
  • the voltage waveform after the insensitive first amplifier 24 and in the lower part of the figure the voltage waveform after the sensitive second amplifier 26 is shown, wherein in the Y-axis, a voltage range is shown up to a limit of 1V, which exemplifies the maximum output amplitude of the amplifiers 24, 26.
  • a weak reflection signal is received, as occurs, for example, when the emitted light pulse passes through the front screen.
  • the amplifier 24 receives too small a partial current I1 and has too low a gain factor to resolve the weak received signal. Therefore, no received signal is detected, and accordingly can be dispensed with in the controller 32 and an evaluation.
  • the weak received signal lies fully in the dynamic range of the second amplifier 26 and is amplified to a well recognizable pulse, which in the illustration even fully exploits the amplitude range. Its position and amplitude can be precisely recognized by the controller 32. The amplitude can be used as a measure of the contamination of the windscreen.
  • FIG. 4 shows for contrast a strong received signal, as it might arise on a surface 16 with reasonably good remission properties.
  • the signal is also superimposed by the windshield reflex according to FIG. 3 ,
  • the amplifier 24 is still too insensitive to resolve the windshield reflex.
  • the measuring pulse can be easily recognized by the surface 16 and can be evaluated precisely without the windshield reflex distorting the measured value in any way.
  • the windscreen reflex is inseparably transformed into a hopelessly overdriven measuring pulse.
  • a distance value determined in this way would be inaccurate, so that this evaluation can at best be used to check the plausibility of the actual measured value from the insensitive amplification path.
  • a waveform with two closely successive received pulses of comparable signal strength for example, at a edge hit or a partially transparent obstacle shortly before a relatively weak remittierenden surface 16.
  • two distinct, easily separable received pulses can be seen.
  • the Position of the measuring pulse or pulses can therefore be calculated precisely.
  • the received signal in the amplification path with the sensitive amplifier 26 is heavily overdriven, and it is not at all apparent that there are two received pulses.
  • the received signal can always be evaluated in one of the two amplification paths over a very wide dynamic range, which far exceeds that of the individual amplifiers 24, 26, without or at least significantly reduced distortions due to overmodulation.
  • the distance can still be calculated, so that the measuring range extends to just in front of the windshield.
  • FIG. 5 shows a further embodiment of the invention with a combined receive signal fed via an adder 38 to a common analog / digital converter 40.
  • the analog / digital converter 40 has its own memory to store the digitized values and to give the controller 32 according to their own time rules access to the sampled received signals.
  • an external memory can be provided, and instead of an adder 38, another element can be used which reversibly combines two or more received signals.
  • the jointly digitized received signals are evaluated in the controller 32.
  • an analog / digital converter can be saved.
  • FIG. 7 This will be an example in the tripartite FIG. 7 in three representations of time-dependent voltage curves - from top to bottom - after the first amplifier 24, the second amplifier 26 and the adder 38 illustrated.
  • the two individual signals from the first and second amplifiers 24, 26 are scaled so that they each utilize half the maximum amplitude of the analog / digital converter 40.
  • the two sub-signals are then added up. This below in FIG. 7 shown sum signal is digitized together in the analog / digital converter. Based on the threshold 44, the two sub-signals can then be digitally separated again.
  • Other mathematical operations for reversible combination and subsequent separation are conceivable, in particular other linear combinations than an equally weighted one.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Optical Radar Systems And Details Thereof (AREA)

Claims (14)

  1. Scanneur à laser (10) mesurant des éloignements, comprenant une source de lumière laser pour émettre un signal lumineux (12), un élément récepteur de lumière pour la réception d'un signal reçu (18), une unité d'évaluation (32), qui est réalisée pour la détermination d'éloignements à partir d'un temps de parcours du signal lumineux (12), ainsi qu'un amplificateur (24, 26) pour le signal reçu (18),
    dans lequel il est prévu au moins un trajet d'amplification sensible avec un premier amplificateur (24) et un trajet d'amplification non sensible avec un second amplificateur (26) ainsi qu'un élément de subdivision de signal reçu (22) via lequel le signal reçu peut être amené parallèlement aux deux trajets d'amplification de telle façon que le signal reçu à l'intérieur d'une plage dynamique plus grande que celle de chaque amplificateur individuel (24, 26) peut être amplifié largement sans perte d'information au moins dans l'un des trajets d'amplification, caractérisé en ce que
    les trajets d'amplification sont menés via un élément de combinaison de signaux (38) à un convertisseur analogique/numérique commun (40), et en ce que l'unité d'évaluation (32) est réalisée pour séparer à nouveau les uns des autres les signaux partiels combinés provenant des trajets d'amplification après la numérisation.
  2. Scanneur à laser (10) selon la revendication 1,
    dans lequel l'élément récepteur de lumière est réalisé pour convertir la lumière reçue en un courant photovoltaïque (I), et dans lequel l'élément de subdivision de signal reçu (22) est capable d'engendrer des courants partiels (I1, I2), en particulier des courants partiels d'intensité différente du courant photovoltaïque (I) et de les amener aux trajets d'amplification.
  3. Scanneur à laser (10) selon la revendication 1 ou 2,
    dans lequel le premier amplificateur (24) est réalisé avec une plage dynamique plus sensible et/ou avec un facteur d'amplification plus fort que le second amplificateur (26).
  4. Scanneur à laser (10) selon l'une des revendications précédentes,
    dans lequel l'amplification totale effective dans le trajet sensible est importante par rapport à l'amplification totale effective dans le trajet non sensible.
  5. Scanneur à laser (10) selon l'une des revendications précédentes,
    dans lequel le convertisseur analogique/numérique (28, 30, 40) est réalisé conjointement avec une mémoire (42) sur un composant dans lequel des signaux reçus numérisés peuvent être déposés.
  6. Scanneur à laser (10) selon l'une des revendications précédentes,
    dans lequel l'élément de combinaison de signaux est réalisé sous forme de circuit d'addition (38).
  7. Scanneur à laser (10) selon l'une des revendications précédentes,
    dans lequel l'unité d'évaluation (32) comprend une portion de prétraitement (34) qui est en particulier réalisée pour un filtrage numérique et/ou une inversion numérique de distorsions connues dans le trajet de traitement analogique disposé avant la numérisation, en particulier dans les trajets d'amplification.
  8. Scanneur à laser (10) selon l'une des revendications précédentes,
    dans lequel l'unité d'évaluation (32) comprend une portion de traitement principale (36) qui est réalisée pour évaluer plusieurs pics ou la totalité des pics d'un signal reçu (18) succédant à un signal lumineux (12) émis pour savoir quel pic doit être associé à un objet (16) dont l'éloignement doit être déterminé, en particulier au moyen d'un accord fonctionnel.
  9. Scanneur à laser (10) selon la revendication 8,
    dans lequel la portion de prétraitement (34) ou la portion de traitement principale (36) est réalisée pour effectuer une présélection au moyen de laquelle une décision est prise, pour une détermination d'éloignement respective, pour savoir s'il s'agit d'évaluer les pics du signal reçu (18) provenant du trajet d'amplification sensible ou ceux provenant du trajet d'amplification non sensible, ou encore ceux provenant des deux trajets d'amplification.
  10. Scanneur à laser (10) selon l'une des revendications précédentes,
    dans lequel il est prévu un troisième et/ou un autre trajet d'amplification avec une plage de sensibilité propre.
  11. Procédé pour la détermination d'éloignements au moyen d'un scanneur à laser (10) à l'aide d'un temps de parcours de la lumière entre l'émission d'un signal lumineux (12) et la réception d'un signal reçu (18), dans lequel le signal reçu est amplifié, et le signal reçu (18) est subdivisé et est amplifié de façon différente dans au moins un trajet d'amplification sensible et un trajet d'amplification parallèle non sensible, dans un amplificateur respectif (24, 26), de sorte que le signal reçu est au total amplifié largement sans perte d'information à l'intérieur d'une plage dynamique qui est plus grande que celle de chaque amplificateur individuel (24, 26),
    caractérisé en ce que le signal reçu (18) est numérisé, et les signaux partiels amplifiés provenant des trajets d'amplification sont combinés de manière réversible et ensuite numérisés conjointement, avant la numérisation, et sont à nouveau séparés les uns des autres après la numérisation.
  12. Procédé selon la revendication 11,
    dans lequel le signal reçu (12) est converti en un courant photovoltaïque (I), et des courants partiels différents (I1, I2) du courant photovoltaïque (I) sont amenés à chaque trajet d'amplification, et dans lequel le signal reçu (18) est amplifié, au moyen de facteurs d'amplification différents des amplificateurs (24, 26) et/ou au moyen du rapport des courants partiels (I1, I2), beaucoup plus fortement que dans le trajet d'amplification non sensible.
  13. Procédé selon la revendication 11 ou 12,
    dans lequel on évalue plusieurs pics ou la totalité des pics d'un signal reçu (18) qui fait suite à un signal lumineux émis (12), pour identifier celui des pics qu'il s'agit d'associer à un objet (16) dont l'éloignement doit être déterminé.
  14. Procédé selon l'une des revendications ont 11 à 13,
    dans lequel, lors de l'évaluation, on décide pour chaque pic si l'on évalue le signal reçu amplifié dans le trajet d'amplification non sensible, le signal reçu amplifié dans le trajet d'amplification sensible, ou encore les deux signaux reçus, et un critère de décision est ici de savoir s'il est possible d'identifier un pic dans le trajet d'amplification non sensible.
EP08105705A 2008-10-30 2008-10-30 Scanner laser mesurant l'éloignement Active EP2182377B1 (fr)

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EP2541273B1 (fr) 2011-06-28 2013-05-22 Sick Ag Détection et détermination de distance d'objets
DE202013100327U1 (de) 2013-01-24 2014-04-29 Sick Ag Optoelektronischer Sensor zur Erfassung von Objekten in einem Überwachungsbereich
DE102013100696B3 (de) * 2013-01-24 2013-11-07 Sick Ag Optoelektronischer Sensor und Verfahren zur Erfassung von Objekten in einem Überwachungsbereich
DE102014102209A1 (de) 2014-02-20 2015-08-20 Sick Ag Entfernungsmessender Sensor und Verfahren zur Abstandsbestimmung von Objekten in einem Ueberwachungsbereich
JP2016014535A (ja) * 2014-06-30 2016-01-28 日本信号株式会社 測距装置
EP2998700B2 (fr) 2014-09-18 2022-12-21 Hexagon Technology Center GmbH Dispositif de mesure de distance électro-optique et procédé de mesure de distance
DE102014116520B4 (de) 2014-11-12 2024-05-02 Pepperl+Fuchs Se Verfahren und Vorrichtung zur Objekterkennung
EP3059608B1 (fr) 2015-02-20 2016-11-30 Sick Ag Capteur optoélectronique et procédé destiné à la détection d'objets
DE102015104021B4 (de) 2015-03-18 2023-03-09 Sick Ag Polygonscanner und Verfahren zum Erfassen von Objekten
EP3091271B1 (fr) 2015-05-05 2018-07-11 Sick Ag Détecteur optique
DE102016121898B4 (de) 2015-12-25 2023-10-19 Panasonic Industrial Devices Sunx Co., Ltd. Lichtrezeptionsstromkreis und photoelektrischer Sensor
EP3330741B1 (fr) 2016-12-05 2019-02-13 Sick Ag Capteur optoélectronique et procédé de détection d'objets dans une zone de détection
JP7081994B2 (ja) * 2018-06-21 2022-06-07 日本信号株式会社 測距方法及び測距装置
EP3588139B1 (fr) 2018-06-26 2020-06-03 Sick Ag Capteur optoélectronique et procédé de détermination de la distance
DE202019100793U1 (de) 2019-02-12 2020-05-15 Sick Ag Optoelektronischer Sensor zur Erfassung von Objekten
DE102019106707A1 (de) * 2019-03-15 2020-09-17 Balluff Gmbh Optische Sensorvorrichtung und Verfahren zum Betreiben einer optischen Sensorvorrichtung

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DE102006060108A1 (de) 2006-12-20 2008-06-26 Sick Ag Laserscanner

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WO2020182255A1 (fr) 2019-03-13 2020-09-17 Jenoptik Optical Systems Gmbh Dispositif de balayage laser et procédé de mesure tridimensionnelle d'une scène à une distance élevée

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